Author:
Konor Celal S.,Randall David A.
Abstract
Abstract. We use a normal-mode analysis to investigate the impacts of the horizontal
and vertical discretizations on the numerical solutions of the
quasi-geostrophic anelastic baroclinic and barotropic Rossby modes on a
midlatitude β plane. The dispersion equations are derived for the
linearized anelastic system, discretized on the Z, C, D, CD, (DC), A, E and B
horizontal grids, and on the L and CP vertical grids. The effects of various
horizontal grid spacings and vertical wavenumbers are discussed. A companion
paper, Part 1, discusses the impacts of the discretization on the
inertia–gravity modes on a midlatitude f plane. The results of our normal-mode analyses for the Rossby waves overall support
the conclusions of the previous studies obtained with the shallow-water
equations. We identify an area of disagreement with the E-grid solution.
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